If you’ve spent dozens of hours exploring Subnautica 2.0’s icy and tropical biomes, you’ve probably thought about tweaking the experience to fit your playstyle. Maybe you want a bigger inventory, new creature variants, or even entire custom biomes to explore. The good news is you can add all that and more, but a lot of new players run into crashes or lost saves when they first try to figure out how to install mods for Subnautica 2.0. I’ve modded my own copy of the game at least 15 times over the last year, and helped a handful of friends set up their mod lists too, so I’ve worked out all the kinks to make the process as painless as possible.
Pre-Install Checks to Avoid Losing Your Subnautica 2.0 Save
Before you download any mod files, you need to take a few quick steps to protect your progress and make sure your install goes smoothly. Skipping these steps is the number one reason I see people posting about corrupted saves or broken game files on community forums, so don’t skip them just to save five minutes.
First, always back up your entire save folder before touching any mod files. You can find your save files in your user directory’s AppData folder for Subnautica 2.0, or you can use the built-in save backup feature on Steam and Epic Games Launcher to save a copy to the cloud. I recommend making a separate copy on your desktop too, just to be extra safe.
Next, verify your game files through your launcher first to rule out corrupted base game files. If you have any missing or broken vanilla game files, adding mods on top will almost always cause crashes. This step only takes two to three minutes for most players, and it eliminates a huge chunk of common troubleshooting issues later on. You should also note that modding is only supported for PC versions of the game right now, console players don’t have access to mod files due to platform restrictions.
Step-by-Step: How to Install Mods for Subnautica 2.0 Safely
All modern Subnautica 2.0 mods run on the BepInEx mod loader, which is a free, open-source tool that lets the game read custom mod files. You don’t need any technical skills to set it up, just follow these steps exactly.
First, download the official 64-bit BepInEx build made for Unity games (the engine Subnautica runs on). Extract the entire zip file directly to your Subnautica 2.0 root folder, which you can find by right-clicking the game in your launcher and selecting “Browse local files”. Don’t extract the files to a subfolder, they need to be in the same folder as the game’s main .exe file to work.
Once you’ve extracted BepInEx, run the game once and wait for the main menu to load, then close it again. This will generate all the required mod folders inside the BepInEx folder, including the plugins folder where you’ll put all your mod files. If you don’t run the game first, these folders won’t exist, and your mods won’t load even if you put them in the right place.
Now you can start downloading mods. only download mods marked as explicitly compatible with Subnautica 2.0, as older mods for the original Subnautica or Below Zero will almost always break your game. Once you download a mod zip file, extract its contents directly to the BepInEx/plugins folder in your game directory. That’s it, the mod is installed.
Essential Mod Testing Tips to Avoid Conflicts
It’s tempting to download 20 cool mods all at once and install them in one go, but that’s the second biggest reason people run into issues. If you install too many mods at once, you won’t be able to tell which one is causing crashes or bugs, and you’ll have to delete all of them and start over. I always recommend testing mods one or two at a time, following these simple steps:
- Install 1-2 mods at a time, launch the game after each install to confirm it loads to the main menu without errors
- Load an existing test save (not your main progress save) to check for gameplay bugs, missing assets, or performance drops
- Note any error pop-ups on launch, and cross-reference them with mod FAQ pages to fix issues fast
- If the game crashes, remove the last mod you installed first before troubleshooting further, as that’s almost always the cause
use a separate test save for all mod testing, never load your main progress save first. Even if a mod says it’s 100% compatible, there’s always a small chance it could corrupt your save, so it’s not worth risking dozens of hours of progress just to test a new creature mod. If the mod works fine on your test save for an hour or two, you can safely load your main save with it enabled.
You might also run into load order issues if you’re using multiple big content mods that change the same parts of the game, like two biome mods that edit the same area. Most mod hosting sites will note load order requirements in the mod description, so just follow those instructions if they’re listed. For casual players only using a few quality of life mods, you won’t need to worry about load order at all.
Common Mod Installation Problems and Quick Fixes
Even if you follow every step perfectly, you might run into a few small issues. Most of them have super simple fixes, so you don’t need to panic if your game doesn’t load right the first time.
If none of your mods are showing up in game, you almost certainly put them in the wrong folder, or you forgot to run the game once after installing BepInEx to generate the plugins folder. Double check that all mod files are directly inside BepInEx/plugins, not in subfolders inside the plugins folder. If you extracted a mod and it has its own folder with the mod files inside, move those files directly to the plugins folder, not the whole mod folder.
If your game crashes on launch after installing a mod, first check if the mod is actually compatible with Subnautica 2.0. never use mods built for the original Subnautica or Below Zero with the 2.0 update, as the game code is very different and those mods will almost always cause crashes. If the mod is compatible, try updating your BepInEx install to the latest version, as older versions of the loader won’t support newer mods.
If you notice big performance drops after installing mods, you’re probably using a poorly optimized visual mod, or you have too many high-resolution texture mods running at once. Try removing high-res texture mods first, as those put the biggest strain on your GPU. You can also lower your in-game graphics settings a little to compensate for the extra work mods put on your system.
If you run into an issue you can’t fix, you don’t need to reinstall the whole game. Just delete the BepInEx folder from your game root directory, verify your game files through your launcher, and you’ll be back to a completely vanilla copy of the game in two minutes, with no damage to your base game or saves.
Once you get the hang of how to install mods for Subnautica 2.0, you can completely transform the game to match whatever playstyle you prefer. I’ve run a list of 13 mods for the last three months, including a custom deep sea biome mod and a quality of life pack that cuts down on inventory management time, and I haven’t had a single crash or save issue following the steps above. If you’re nervous about messing up your game, start small with 1-2 simple quality of life mods first, and work your way up to bigger content mods as you get comfortable. The best part is, if anything goes wrong, you can always delete your BepInEx folder and verify game files to go back to vanilla in two minutes flat.
